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How to Reuse Greywater Safely
The responsible collection and use of greywater in the home or gardens has many benefits. While there are risks to reusing greywater, a few simple steps and suggestions should be followed.

Greywater can be reused safely by adopting the do’s and dont’s below:
Do's:
  • Select a greywater system that has been approved for installation in WA.
  • Use a licensed plumber to install the system
  • Use environment-friendly soaps and detergents. Select washing powders or liquids which contain low levels of phosphorus, boron and sodium. Generally, liquid laundry detergents have lower salt content than powders.
  • Undertake regular maintenance, such as cleaning the filters or tanks, checking pumps, flushing irrigation lines, cleaning vacuum breakers. Read the homeowner’s guide for this system, and follow the maintenance schedule.
  • Divert greywater from your system back into the sewer line during winter when your garden may not need additional watering.
  • Monitor plant and soil response to greywater irrigation. Some plants do not survive in alkaline or salty soil conditions.
  • Only use purple dripline in subsurface irrigation (100 mm below the surface of soil or mulch).
  • Wear gloves when you are performing maintenance. Wash your hands thoroughly afterwards.
  • Greywater can be used to irrigate above-ground food crops. There should not be contact of any edible fruit or vegetable part with the soil
Don'ts:
  • Divert any greywater from the kitchen as this does not have approval from the Department of Health.
  • Greywater must not be sprayed onto edible (food) plants.
  • Do not overuse bleaches, fabric softeners or washing products containing borax or chlorine. Biodegradable products should be used.
  • Do not use greywater from the washing of nappies and/or soiled clothing. This includes materials used in painting, hair dyes or other chemicals.
  • Do not use greywater from any source if a member of the family has an infectious disease, such as diarrhoea, intestinal parasites or hepatitis.
  • Greywater must not be stored for any length of time – other than that required if a sedimentation tank is used in the system. Stored greywater will turn septic and cause unpleasant smells.
  • Do not use greywater to top up rainwater tanks or swimming pools, nor wash vehicles or paths.
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